Initial commit

typo3conf/ext/scriptmerger/Classes/ScriptmergerConditionalCommentPreserver.php

@@ -0,0 +1,97 @@
+<?php
+
+namespace SGalinski\Scriptmerger;
+
+/***************************************************************
+ *  Copyright notice
+ *
+ *  (c) Stefan Galinski <stefan@sgalinski.de>
+ *  All rights reserved
+ *
+ *  This script is part of the TYPO3 project. The TYPO3 project is
+ *  free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  The GNU General Public License can be found at
+ *  http://www.gnu.org/copyleft/gpl.html.
+ *
+ *  This script is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  This copyright notice MUST APPEAR in all copies of the script!
+ ***************************************************************/
+
+/**
+ * This class contains the basic stuff required for preserving conditional comments
+ */
+class ScriptmergerConditionalCommentPreserver {
+	/**
+	 * holds the conditional comments
+	 *
+	 * @var array
+	 */
+	protected $conditionalComments = array();
+
+	/**
+	 * Callback function to replace conditional comments with placeholders
+	 *
+	 * @param array $hits
+	 * @return string
+	 */
+	protected function save($hits) {
+		$this->conditionalComments[] = $hits[0];
+		return '###conditionalComment' . (count($this->conditionalComments) - 1) . '###';
+	}
+
+	/**
+	 * Callback function to restore placeholders for conditional comments
+	 *
+	 * @param array $hits
+	 * @return string
+	 */
+	protected function restore($hits) {
+		$results = array();
+		preg_match('/\d+/is', $hits[0], $results);
+		$result = '';
+		if (count($results) > 0) {
+			$result = $this->conditionalComments[$results[0]];
+		}
+		return $result;
+	}
+
+	/**
+	 * This method parses the output content and saves any found conditional comments
+	 * into the "conditionalComments" class property. The output content is cleaned
+	 * up of the found results.
+	 *
+	 * @return void
+	 */
+	public function read() {
+		$pattern = '/<!--\[if.+?<!\[endif\]-->/is';
+		$GLOBALS['TSFE']->content = preg_replace_callback(
+			$pattern,
+			array($this, 'save'),
+			$GLOBALS['TSFE']->content
+		);
+	}
+
+	/**
+	 * This method writes the conditional comments back into the final output content.
+	 *
+	 * @return void
+	 */
+	public function writeBack() {
+		$pattern = '/###conditionalComment\d+###/is';
+		$GLOBALS['TSFE']->content = preg_replace_callback(
+			$pattern,
+			array($this, 'restore'),
+			$GLOBALS['TSFE']->content
+		);
+	}
+}
+
+?>